package facede.hometheater;


class Screen {
    private static Screen instance = null;
    private Screen(){

    }
    static Screen getInstance(){
        if (instance == null){
            instance = new Screen();
        }
        return instance;
    }
    void up(){
        System.out.println("Screen up");
    }
    void down(){
        System.out.println("Screen down");
    }
}
